Flywheel stores the energy for usage. When the torque is applied to the flywheel, it energy is preserved in its rotational momentum. When they need more energy, the energy is gathered and the flywheel slows the speed. The flywheels we use nowadays utilize magnets to rotate, and the speed can be tens of thousands of times per minute. What's more, the flywheels, comparing to earlier one, generates mechanical and electrical energy, and some are even for solar and wind energy. Generally speaking, the flywheels are inexpensive and more reliable than batteries. It is quite important for you to have a top shape flywheel in your BMW car. You are supposed to do regular maintenance and check if your flywheel works properly. Once you decide to change, we are glad to be your first choice and we offer you all BMW genuine OEM flywheel with a discounted price.